SBG, on Jan 29 2010, 04:53 AM, said:
Hey guys,
Recently, during my exam week, I've started to get into a little mapping for eDuke. It's going decently; I'm not great, but I'm not bad either. I have an idea for a mod, which I'll hopefully be able to show some work for in the next few weeks, but I'm looking for some tutorials on CON coding, modeling (weapons and such; not art tiles), and some advanced map making ideas.
Hopefully you guys can help.

You are probably already aware of the wiki as a source of CON scripting information and other stuff, but just in case here it is:
http://wiki.eduke32.com/wiki/Main_Page
For advanced map making ideas, I would play a lot of different user maps. Again, you are probably already aware of this site, but just in case:
http://dukerepository.com/
My advise is to just focus on one thing and get something finished before trying to make a whole mod. In your case that would be a map since you have already been mapping. People usually underestimate how difficult it is to get something finished.